Auto indus­try offi­cials say the Envi­ron­men­tal Pro­tec­tion Agency is dis­cour­ag­ing the indus­try from using Start-Stop, a tech­nol­o­gy that can briefly shut down a vehicle’s engine instead of wast­ing gas by idling. The Feds say the fuel econ­o­my test cycle results make it dif­fi­cult to jus­ti­fy the added cost of about $300 — $500 per vehi­cle. Some mak­ers have decid­ed not to wait for the EPA to act and plan to intro­duce the tech­nol­o­gy to the Amer­i­can mar­ket.